www: wire up search to use async xap_helper

The C++ version of xap_helper will allow more complex and
expensive queries.  Both the Perl and C++-only version will
allow offloading search into a separate process which can be
killed via ITIMER_REAL or RLIMIT_CPU in the face of overload.

The xap_helper `mset' command wrapper is simplified to
unconditionally return rank, percentage, and estimated matches
information.  This may slightly penalize mbox retrievals and
lei users, but perhaps that can be a different command entirely.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/PublicInbox/MboxGz.pm b/lib/PublicInbox/MboxGz.pm
index 533d2ff1..864d701e 100644
--- a/lib/PublicInbox/MboxGz.pm
+++ b/lib/PublicInbox/MboxGz.pm
@@ -13,8 +13,8 @@ sub async_next ($) {
         my ($http) = @_; # PublicInbox::HTTP
         my $ctx = $http->{forward} or return;
         eval {
-                $ctx->{smsg} = $ctx->{cb}->($ctx) or return $ctx->close;
-                $ctx->smsg_blob($ctx->{smsg});
+                my $smsg = $ctx->{cb}->($ctx, $http) // return $ctx->close;
+                $smsg and $ctx->smsg_blob($ctx->{smsg} = $smsg);
         };
         warn "E: $@" if $@;
 }